fergus07 writes: Apple's desktop lineup has typically pushed users requiring plenty of fast I/O towards the Mac Pro — but the latest iMac refresh has broken the tradition. Quad-core Sandy Bridge CPUs and faster ATI Radeon HD GPUs are welcomed, but it's the addition of Thunderbolt ports (one in the 21.5-inch and two in the 27-inch) that really ups the ante for a number of professional users.